class Section(db.Model):
    __tablename__ = "section"

    section_id = db.Column(db.Integer, primary_key=True, unique=True)
    course_id = db.Column(db.Integer, db.ForeignKey("course.course_id"))
    semester = db.Column(db.String(5))
    teaches = db.relationship("Teaches", backref="section")
    takes = db.relationship("Takes", backref="section")